San Antonio, TX USA: President John F. Kennedy and Jacqueline Kennedy arrival in San Antonio.

San Antonio, TX USA: President John F. Kennedy and Jacqueline Kennedy arrival in San Antonio.

Photo: Tom Atkins, File Photo

San Antonio, TX USA: President John F. Kennedy and Jacqueline... Photo-7181837.74209 - San Antonio Express-News

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President John F. Kennedy and wife Jacqueline arrive at the San Antonio International Airport on Nov. 21, 1963.

President John F. Kennedy and wife Jacqueline arrive at the San Antonio International Airport on Nov. 21, 1963.

Photo: Art Rickerby, Time & Life Pictures Via Getty Images

President John F. Kennedy and wife Jacqueline arrive at the San... Photo-5474734.74209 - San Antonio Express-News

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President John F. Kennedy and wife Jacqueline arrive at the San Antonio International Airport on Nov. 21, 1963.

President John F. Kennedy and wife Jacqueline arrive at the San Antonio International Airport on Nov. 21, 1963.

Photo: Art Rickerby, Time & Life Pictures Via Getty Images

President John F. Kennedy and wife Jacqueline arrive at the San... Photo-5474743.74209 - San Antonio Express-News

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President John F. Kennedy's car waits as a crowd watches at the San Antonio International Airport on Nov. 21, 1963.

President John F. Kennedy's car waits as a crowd watches at the San Antonio International Airport on Nov. 21, 1963.

Photo: San Antonio Light File Photo

President John F. Kennedy's car waits as a crowd watches at... Photo-5474697.74209 - San Antonio Express-News

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U.S. Congressman Henry B. Gonzalez, four of his children and wife Bertha (walking up behind them) were on hand when the Kennedys arrived on Nov. 21, 1963, at San Antonio International Airport.

U.S. Congressman Henry B. Gonzalez, four of his children and wife Bertha (walking up behind them) were on hand when the Kennedys arrived on Nov. 21, 1963, at San Antonio International Airport.

Photo: Cecil Stoughton, JFK Presidential Library

U.S. Congressman Henry B. Gonzalez, four of his children and wife... Photo-5472856.74209 - San Antonio Express-News

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President John F. Kennedy and wife Jacqueline arrive at the San Antonio International Airport on Nov. 21, 1963.

President John F. Kennedy and wife Jacqueline arrive at the San Antonio International Airport on Nov. 21, 1963.

Photo: Art Rickerby, Time & Life Pictures Via Getty Images

President John F. Kennedy and wife Jacqueline arrive at the San... Photo-5474742.74209 - San Antonio Express-News

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President John F. Kennedy and Jacqueline Kennedy arrival in San Antonio on Nov. 21, 1963.

President John F. Kennedy and Jacqueline Kennedy arrival in San Antonio on Nov. 21, 1963.

Photo: Tom Atkins, Public Domain

President John F. Kennedy and Jacqueline Kennedy arrival in San... Photo-5472854.74209 - San Antonio Express-News

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President John F. Kennedy and his wife, Jacqueline, are surrounded by security during their visit to San Antonio on Nov. 21, 1963, one day before his assassination.

President John F. Kennedy and his wife, Jacqueline, are surrounded by security during their visit to San Antonio on Nov. 21, 1963, one day before his assassination.

Photo: EXPRESS-NEWS FILE PHOTO

President John F. Kennedy and his wife, Jacqueline, are surrounded... Photo-5472845.74209 - San Antonio Express-News

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Photographers take photos of Jacqueline Kennedy at San Antonio International Airport on Nov. 21, 1963.

Photographers take photos of Jacqueline Kennedy at San Antonio International Airport on Nov. 21, 1963.

Photo: Art Rickerby, Time & Life Pictures Via Getty Images

Photographers take photos of Jacqueline Kennedy at San Antonio... Photo-5474737.74209 - San Antonio Express-News

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President John F. Kennedy and wife Jacqueline were greeted by a crowd at the San Antonio International Airport on Nov. 21, 1963.

President John F. Kennedy and wife Jacqueline were greeted by a crowd at the San Antonio International Airport on Nov. 21, 1963.

Photo: Art Rickerby, Time & Life Pictures Via Getty Images

President John F. Kennedy and wife Jacqueline were greeted by a... Photo-5474740.74209 - San Antonio Express-News

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President John F. Kennedy and wife Jacqueline arrive at San Antonio International Airport on Nov. 21, 1963.

President John F. Kennedy and wife Jacqueline arrive at San Antonio International Airport on Nov. 21, 1963.

Photo: Art Rickerby, Time & Life Pictures Via Getty Images

President John F. Kennedy and wife Jacqueline arrive at San... Photo-5474749.74209 - San Antonio Express-News

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A rear view photo shows the length of the crowd lining the runway at San Antonio International Airport as the two couples, followed by a Secret Service car, head for ceremonies at Brooke Medical Center in San Antonio on Nov. 21, 1963. less

A rear view photo shows the length of the crowd lining the runway at San Antonio International Airport as the two couples, followed by a Secret Service car, head for ceremonies at Brooke Medical Center in San ... more

Photo: CECIL W. STOUGHTON, WHITE HOUSE

A rear view photo shows the length of the crowd lining the runway... Photo-5472837.74209 - San Antonio Express-News

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President John F. Kennedy is etched in bright sunlight at the San Antonio International Airport on Nov. 21, 1963, one day before he was assassinated in Dallas.

President John F. Kennedy is etched in bright sunlight at the San Antonio International Airport on Nov. 21, 1963, one day before he was assassinated in Dallas.

Photo: San Antonio Light File Photo

President John F. Kennedy is etched in bright sunlight at the San... Photo-5474691.74209 - San Antonio Express-News

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President and Mrs. John F. Kennedy in San Antonio during his visit on Nov. 21, 1963. On the right shaking JFK's hand is SAPD officer Johnny Munoz.

President and Mrs. John F. Kennedy in San Antonio during his visit on Nov. 21, 1963. On the right shaking JFK's hand is SAPD officer Johnny Munoz.

Photo: EXPRESS-NEWS ARCHIVES

President and Mrs. John F. Kennedy in San Antonio during his visit... Photo-5472843.74209 - San Antonio Express-News

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President John F. Kennedy is seen before getting into his motorcade car in San Antonio on Nov. 21, 1963, the day before he was assassinated in Dallas.

President John F. Kennedy is seen before getting into his motorcade car in San Antonio on Nov. 21, 1963, the day before he was assassinated in Dallas.

Photo: San Antonio Express-News File Photo

President John F. Kennedy is seen before getting into his motorcade... Photo-5537773.74209 - San Antonio Express-News

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Texas Gov. John B. Connally Jr. drives President John F. Kennedy and Jacqueline Kennedy at San Antonio International Airport on Nov. 21, 1963.

Texas Gov. John B. Connally Jr. drives President John F. Kennedy and Jacqueline Kennedy at San Antonio International Airport on Nov. 21, 1963.

President John F. Kennedy's motorcade cruises through San Antonio on Nov. 21, 1963, the day before he was assassinated in Dallas.

President John F. Kennedy's motorcade cruises through San Antonio on Nov. 21, 1963, the day before he was assassinated in Dallas.

Photo: San Antonio Express-News File Photo

President John F. Kennedy's motorcade cruises through San... Photo-5537774.74209 - San Antonio Express-News

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Schoolchildren wave as President John F. Kennedy's motorcade passes through San Antonio on Nov. 21, 1963, the day before he was assassinated in Dallas.

Schoolchildren wave as President John F. Kennedy's motorcade passes through San Antonio on Nov. 21, 1963, the day before he was assassinated in Dallas.

Photo: San Antonio Express-News File Photo

Schoolchildren wave as President John F. Kennedy's motorcade... Photo-5537776.74209 - San Antonio Express-News

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Stanley McClellan (right background) waves from his vantage point on the back of his Southwestern Bell truck as he and schoolchildren from Cambridge School watch President John F. Kennedy's motorcade go down Broadway on Nov. 21, 1963. less

Stanley McClellan (right background) waves from his vantage point on the back of his Southwestern Bell truck as he and schoolchildren from Cambridge School watch President John F. Kennedy's motorcade go down ... more

President John F. Kennedy and Texas Gov. John Connolly arrive at Brooks AFB on Nov. 21, 1963.

President John F. Kennedy and Texas Gov. John Connolly arrive at Brooks AFB on Nov. 21, 1963.

Photo: COURTESY WITTE MUSEUM

President John F. Kennedy and Texas Gov. John Connolly arrive at... Photo-5472850.74209 - San Antonio Express-News

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President John F. Kennedy shakes hands with the crowd at Brooks AFB during his visit to San Antonio on Nov. 21, 1963.

President John F. Kennedy shakes hands with the crowd at Brooks AFB during his visit to San Antonio on Nov. 21, 1963.

Photo: EXPRESS-NEWS FILE PHOTO

President John F. Kennedy shakes hands with the crowd at Brooks AFB... Photo-5472842.74209 - San Antonio Express-News

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Eager hands reach out to shake hands with President John F. Kennedy and first lady Jacqueline Kennedy as they visited San Antonio, where the president dedicated the Aerospace Medical Center at Brooks Air Force Base, Nov. 21, 1963. less

Eager hands reach out to shake hands with President John F. Kennedy and first lady Jacqueline Kennedy as they visited San Antonio, where the president dedicated the Aerospace Medical Center at Brooks Air Force ... more

Photo: Ted Powers, Associated Press File Photo

Eager hands reach out to shake hands with President John F. Kennedy... Photo-5474755.74209 - San Antonio Express-News

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President John F. Kennedy and First Lady Jacqueline Kennedy at Brooks Medical Research Center in San Antonio on Nov. 21, 1963.

President John F. Kennedy and First Lady Jacqueline Kennedy at Brooks Medical Research Center in San Antonio on Nov. 21, 1963.

Photo: San Antonio Light File Photo

President John F. Kennedy and First Lady Jacqueline Kennedy at... Photo-5474698.74209 - San Antonio Express-News

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A crowd gathers at Brooks Medical Research Center to see President John F. Kennedy speak on Nov. 21, 1963.

A crowd gathers at Brooks Medical Research Center to see President John F. Kennedy speak on Nov. 21, 1963.

Photo: San Antonio Light File Photo

A crowd gathers at Brooks Medical Research Center to see President... Photo-5474692.74209 - San Antonio Express-News

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Bertha Gonzalez (in red, behind Lyndon Johnson) was given a kiss by President Kennedy when he and Jackie arrived in San Antonio on Nov. 21, 1963.

Bertha Gonzalez (in red, behind Lyndon Johnson) was given a kiss by President Kennedy when he and Jackie arrived in San Antonio on Nov. 21, 1963.

A crowd gathers at Brooks Medical Research Center to see President John F. Kennedy speak on Nov. 21, 1963.

A crowd gathers at Brooks Medical Research Center to see President John F. Kennedy speak on Nov. 21, 1963.

Photo: San Antonio Light File Photo

A crowd gathers at Brooks Medical Research Center to see President... Photo-5474695.74209 - San Antonio Express-News

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President John F. Kennedy, his wife Jacqueline Kennedy and Vice President Lyndon Johnson sit during the Aerospace Medical Health Center dedication ceremony at Brooks AFB in San Antonio on Nov. 21, 1963.

President John F. Kennedy, his wife Jacqueline Kennedy and Vice President Lyndon Johnson sit during the Aerospace Medical Health Center dedication ceremony at Brooks AFB in San Antonio on Nov. 21, 1963.

Photo: Art Rickerby, Time & Life Pictures Via Getty Images

President John F. Kennedy, his wife Jacqueline Kennedy and Vice... Photo-5474731.74209 - San Antonio Express-News

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President John F. Kennedy attends the dedication ceremony of the Aerospace Medical Center at Brooks Air Force Base in San Antonio, Nov. 21, 1963. Vice President Lyndon B. Johnson, first lady Jacqueline Kennedy, Johnson's wife Lady Bird Johnson, Texas Gov. John Connally and his wife Nellie Connally, along with other dignitaries applaud at seats behind rostrum. less

President John F. Kennedy attends the dedication ceremony of the Aerospace Medical Center at Brooks Air Force Base in San Antonio, Nov. 21, 1963. Vice President Lyndon B. Johnson, first lady Jacqueline Kennedy, ... more

Photo: Associated Press File Photo

President John F. Kennedy attends the dedication ceremony of the... Photo-5474754.74209 - San Antonio Express-News

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President John F. Kennedy looks over at his wife Jacqueline, who is standing next to Vice President Lyndon Johnson, during the Aerospace Medical Health Center dedication ceremony at Brooks AFB in San Antonio on Nov. 21, 1963. less

President John F. Kennedy looks over at his wife Jacqueline, who is standing next to Vice President Lyndon Johnson, during the Aerospace Medical Health Center dedication ceremony at Brooks AFB in San Antonio on ... more

Photo: Art Rickerby, Time & Life Pictures Via Getty Images

President John F. Kennedy looks over at his wife Jacqueline, who is... Photo-5474751.74209 - San Antonio Express-News

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President John F. Kennedy speaks at dedication ceremonies of the Aerospace Medical Center at Brooks Air Force Base, San Antonio, Nov. 21, 1963.

President John F. Kennedy speaks at dedication ceremonies of the Aerospace Medical Center at Brooks Air Force Base, San Antonio, Nov. 21, 1963.

Photo: San Antonio Express-News File Photo

President John F. Kennedy speaks at dedication ceremonies of the... Photo-5537768.74209 - San Antonio Express-News

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President John F. Kennedy speaks at dedication ceremonies of the Aerospace Medical Center at Brooks Air Force Base, San Antonio, Nov. 21, 1963. First lady Jacqueline Kennedy, Vice President Lyndon B. Johnson, his wife Lady Bird Johnson, and other dignitaries occupy seats behind the speaker's rostrum. less

President John F. Kennedy speaks at dedication ceremonies of the Aerospace Medical Center at Brooks Air Force Base, San Antonio, Nov. 21, 1963. First lady Jacqueline Kennedy, Vice President Lyndon B. Johnson, ... more

Photo: Ted Powers, Associated Press File Photo

President John F. Kennedy speaks at dedication ceremonies of the... Photo-5474758.74209 - San Antonio Express-News

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First Lady Jacqueline Kennedy chats with Vice President Lyndon B. Johnson as Nellie Connally looks on at right, during dedication ceremonies of the Aerospace Medical Center at Brooks Air Force Base in San Antonio, Nov. 21, 1963. Lady Bird Johnson is seated at left. less

First Lady Jacqueline Kennedy chats with Vice President Lyndon B. Johnson as Nellie Connally looks on at right, during dedication ceremonies of the Aerospace Medical Center at Brooks Air Force Base in San ... more

The crowd listens as President John F. Kennedy speaks at the dedication ceremonies of the Aerospace Medical Center at Brooks Air Force Base, San Antonio, Nov. 21, 1963.

The crowd listens as President John F. Kennedy speaks at the dedication ceremonies of the Aerospace Medical Center at Brooks Air Force Base, San Antonio, Nov. 21, 1963.

Photo: San Antonio Express-News File Photo

The crowd listens as President John F. Kennedy speaks at the... Photo-5537767.74209 - San Antonio Express-News

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President John F. Kennedy speaks at Brooks Medical Research Center on Nov. 21, 1963.

President John F. Kennedy speaks at Brooks Medical Research Center on Nov. 21, 1963.

Photo: Tom Atkins, Public Domain

President John F. Kennedy speaks at Brooks Medical Research Center... Photo-5472855.74209 - San Antonio Express-News

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President John F. Kennedy speaks at dedication ceremonies of the Aerospace Medical Center at Brooks Air Force Base, San Antonio, Nov. 21, 1963. From left, seated behind the rostrum are Texas Gov. John Connally, Lady Bird Johnson, wife of the vice president, an unidentified officer, and first lady Jacqueline Kennedy. less

President John F. Kennedy speaks at dedication ceremonies of the Aerospace Medical Center at Brooks Air Force Base, San Antonio, Nov. 21, 1963. From left, seated behind the rostrum are Texas Gov. John ... more

Photo: Associated Press File Photo

President John F. Kennedy speaks at dedication ceremonies of the... Photo-5474759.74209 - San Antonio Express-News

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Vice President Lyndon Johnson sits with Jacqueline Kennedy at the dedication of the Aerospace Medical Health Center at Brooks AFB in San Antonio on Nov. 21, 1963.

Vice President Lyndon Johnson sits with Jacqueline Kennedy at the dedication of the Aerospace Medical Health Center at Brooks AFB in San Antonio on Nov. 21, 1963.

The crowd applauds after President John F. Kennedy speaks at the dedication ceremonies of the Aerospace Medical Center at Brooks Air Force Base, San Antonio, Nov. 21, 1963.

The crowd applauds after President John F. Kennedy speaks at the dedication ceremonies of the Aerospace Medical Center at Brooks Air Force Base, San Antonio, Nov. 21, 1963.

Photo: San Antonio Express-News File Photo

The crowd applauds after President John F. Kennedy speaks at the... Photo-5537766.74209 - San Antonio Express-News

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President John F. Kennedy and First Lady Jacqueline Kennedy tour the Aerospace Medical Center at Brooks Air Force Base during a visit on San Antonio on Nov. 21, 1963.

President John F. Kennedy and First Lady Jacqueline Kennedy tour the Aerospace Medical Center at Brooks Air Force Base during a visit on San Antonio on Nov. 21, 1963.

Photo: San Antonio Express-News File Photo

President John F. Kennedy and First Lady Jacqueline Kennedy tour... Photo-5537771.74209 - San Antonio Express-News

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President John F. Kennedy on his visit to the Aero Space Medical Center at Brooks Air Force Base, Nov. 21, 1963, in San Antonio. Pres. Kennedy looks through a viewing window at four airmen who have undergoing tests in the space chamber for 17 days. They are undergoing conditions of a simulated altitude of 27, 500 feet and will come out in 13 more days. less

President John F. Kennedy on his visit to the Aero Space Medical Center at Brooks Air Force Base, Nov. 21, 1963, in San Antonio. Pres. Kennedy looks through a viewing window at four airmen who have undergoing ... more

Photo: Associated Press File Photo

President John F. Kennedy on his visit to the Aero Space Medical... Photo-5474753.74209 - San Antonio Express-News

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President John F. Kennedy and First Lady Jacqueline Kennedy tour the Aerospace Medical Center at Brooks Air Force Base during a visit on San Antonio on Nov. 21, 1963.

President John F. Kennedy and First Lady Jacqueline Kennedy tour the Aerospace Medical Center at Brooks Air Force Base during a visit on San Antonio on Nov. 21, 1963.

Photo: San Antonio Express-News File Photo

President John F. Kennedy and First Lady Jacqueline Kennedy tour... Photo-5537770.74209 - San Antonio Express-News

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President John F. Kennedy tours the Aerospace Medical Center at Brooks Air Force Base during a visit on San Antonio on Nov. 21, 1963.

President John F. Kennedy tours the Aerospace Medical Center at Brooks Air Force Base during a visit on San Antonio on Nov. 21, 1963.

Texas Gov. John B. Connally Jr. with his wife Nellie, President John F. Kennedy and First Lady Jacqueline Kennedy are seen in their motorcade car in San Antonio on Nov. 21, 1963, one day before Kennedy's assassination in Dallas. less

Texas Gov. John B. Connally Jr. with his wife Nellie, President John F. Kennedy and First Lady Jacqueline Kennedy are seen in their motorcade car in San Antonio on Nov. 21, 1963, one day before Kennedy's ... more